Breast drill



F. E. FARLEY 1,770,884

BREAST DRILL July 15, 1930.

Filed March 20, v1950 Mge mlm1 /NVENTOR #il YM -BYMWMV' ATTORNEY rnEn E.. malanni' onennnnrrn'nn ivrnssnoiinsnrrs, ',.AssrGNoa fro "commit-PRATT: i

Patented July 15,.Y 19,301" Y :i

.-coMPANY, or GREENEIELD, MASSACHUSETTS, A conronnaron on lvrnssnorrUsa'r'rs` Y BREAST DRVILI"l if,

` .Application filed March20,"1930,v Serial No. $137,391.A Y

, Thisinvention relates to breast drillsfrof the changegear type and more-particularly.

to an extremely simple: construction-that can be manufactured 'atlow cost.` s

j Various forms?l of, breast drills provided with change gears for operating the drillat dilferent speeds have been proposed hereto fore, but mostiof the prior devices have been more or lesseXpensive-to manufacture. The

presentinventiontherefore relates to asimplifiedconstructlon that can be manufactured 'p at lowcost and with a minimum number of machine operations. 'p `One important feature of the present 1n'- vention resides in .a breast drill consisting of a spindle supporting frame that is slidably secured to the main post 'orstockfor relative adjustmentto meshthediderent speed'gears.-

'Another feature `of the invention vresides in the construction whereby thetransversely extending shaft'upon which the drive wheel or gearisjournaled serves also 'tocl'amptlie main post andqframe in dilferentpositions of relative adjustment.,

{Still another feature ofthe invention resides in a breast drill inwhichV the driving wheel or gear is connected to themainpost while the rotating spindle having the bevel.

pinions and chuck lis `supported so that the post and driving wheel may beshifted togethel" relative to thespindle to change ,the Speed of thel spindle.`

Other featuresof the invention and novel` combination'of parts in additionto the above will be hereinafter described =in connection with the accompanying drawings which illustion.Y

trate one good practical form of the-invenf Inthe drawings:l

Fig-"Lis a sideelevation ofvabreast drill constructed in accordance withvthepresent f invention Fig. 2 is a sectional elevation taken at righ-t angles to the elevation of Fig. 1; and

. Fig. 3 is a side elevationof a bracket forming the intermediate portion fof the breast drill.

has a post or stock10 which may conveniently be formed of aroundinetalbar as shown and the post lO'is' provided lat its upper end 'with' abreast platel'l, which may be firmly secured to the post by 'asetscrew 11a. The lowerv endV of .thepostlO is slidablymounted -in a,V sleeve 12-provided at the upper end ofthe bracket Thejbracket preferably hasthe constrcgf tion best shown lin F 3 andconsistsof'th'e ,p a

upper sleeve v12 and lowersleevejl whichy are supported in spaced relation' to each otherby the laterally spaced ribs 1 5, the construction being such that a clearance space isprovided between thelower end of the, sleeve' 12J and the upper end 'of the sleevevl Vadapted to receive the bevel pinions tobe described.` kThe sleeve 12 is Vfurthe 'gated slot 16. i

smalll bevel pinions 1 9 and 2O, which 'are mounted onV the spindle 17 torotate within the :clearancespace of the frame. 13 above mentioned. A'secured to the spindle 17 bya p in121 entend-l These two pinions are conveniently ing through the spindle 17 and which lies in notches formed in the hubs ofthe pinions19,

20. VThe'flfkzonstruction' is such tha'tthe pin 2l 'O rmlysecu'res the pinions to' the'spindle so asto prevent rotation therebetween while fat Y the 'same time the engagement of the outer faces of the pinions witlnthe inner'ends-of thespaced sleeves-*12, 14 prevents longitudinal 'movement of the spindle 'within the frame The means-for rotating the spindle 17 and its chucl; at different speeds consists of a driv-v ing wheel 22 having the large 4,beve-l lgear 23 andthe slnaller'bevel gear24,and the driving provided lwithan elonj Within theflower sleeve' 1 4' ofjthe bracket v Y 13 isrotatably mounted the spindle 127 adapted] V to support and rotate the `chuck 18 whichmay be ofthe usual or any preferred construction.4 VThe spindle 17 is provided with the large and wheel 22 is Vjournaledfupon a transversely y extending bolt or shaft -25 whichisprovided at oneend with the head 26 and atitsopposite l. (end withthethreads 27. The bolt 25 is preferably provided with an enlarged por n Y u tion 28 .upon which the driving wheel 22 is Thebreast drill illustrated in the drawings journaledf- In the construction shown the bolt 25eXtends through a. hole, 29 formed rangement being suoli that when the parts so far described are assembled the post 10 distance the transversely extending bolt 29 is permitted to move in the` elongated clear.-

anceslt16. K, 4 The relative movement just .described between the post and frame 13 serves-to per' init the high speed gears 19, 23 to be meshed as shown in Fig. 2er the low speed gears 20, 2e to be-meshed as shown in Fig.f1.

After the frame 13 and post shifted relative to each other to engagethe lesired cooperating gears,the frame and post .may be clamped in the desired position of yad- 'ustmeiit b'` tightening the tool su iortinfr c 2D 1 C handle 29, upon the bolt 25, the handle being provided to this end `with thel internally threaded sleeve 30. Fitt-washer 31`provieed between-the inner face of the drivingwheel and a ,side face of the frame 13 serves to keep this wheel properlyspaced from theframe and the shoulder provided upon the bolt Q5 at the inner endof the enlarged portion Q8 r engages the outer face Vof the washer 31 to receive the longitudinal thrust exerted upon'- the bolt 25 when the handle 29 is rotated to clamp the parts in the -position in which they are shown in Figl or in the position in which they are shown in Fig. Movement of the frame 13 relative tothe post 10 after the parts have been clamped in the desiredV position of adjustment Y providingthe frame' 13 with the lugs 32 adaptedtecooperate with thev washer 31 to prevent the latter from sliding upon the ,face of the frame. 'A washer 33 is preferably provided between the'opposite face of the frame 13 and the inner end of the handle 29 as shown in Fig. 2. The drivingwheel 22 may be rotated by the crank arin34l provided at'its outer end with the handle 35 and in the construction shown the inner end o-f the crank handle is notched s that it will fitthe annular groove 36 .formed inthe hub, ofthedriv# ing ivheelQQ, and an intermediate portion of the crank 3st is secured to the driving'wheel-22 by the screw 37,. Y

It will be seen from the foregoing that the frame 13 constitutesthe means for holding thepost 10 and spindle 17 in axial alignment so that one may be shifted towards and from the other to engage the different gears. It will also be seen that the frame 13 rotatably supports the spindle 17 and through the cooperation of the pinions 19, 2O holds the spindle 1T against longitudinal movement within the frame. It will further be seen that when it is desired to shift the cooperating gears to vary the speed of the drill all that is necessary is to back off the handle 29 to permit the post 1() and driving wheel/22 connected thereto to be shifted lengthwise of the frame 13. 1t will be apparent from the foregoing description and drawings that the applicable to Vmay be readily produced by providing the 10. have been may be further prevented byv breast drill of the present invention consists of a small number of parts, "all of which are may be slid lengthwiseof the vframe 13 theY market at lowcost. f. Y a

While the features o l the present invention have been shown and described in connection with a breast Ydrill itis to vbe understood that the construction'of the vpresent invention'V is hand drills of the type that post 10 of the present breast drill with a handle at its upper end in place of the breast plate 11. Y Y 1 `TWhat is yclaimed is .1

1. Abreast .drill comprising ini-combines.

tion, a rctatingspindle carrying a chuck, a'

main post provided with Ameans for rotatably supporting the spindle,- a two speed drive for saidspindle includingA a pair of pinions rigidly secured to the -spindle and a driving wheel provided with ai'large bevel gear andV a smaller bevel gear, and means for supporting said spindle for axial movement relative to said-post to. engage either of the gears with a pinion. 1

2. A breastl drill comprising in combination, a ,main post, a frame s'lidably secured to said post, a spindle rotatably supported bythe frame and provided witha chuck, a two'speed drive for said spindle includingl a pair of pinicns on the spindle and a driving wheel-provided with a large' bevel Ygear and a smaller bevel gear, andmeans whereby the post and frame may be relatively' shifted to en 'ac'egeithervof the gears with a inion.

3. Av breast drill comprising in combination, a mainpost, arotating'spindle provided with a chuclga frame slidably secured to said post and constructed to rotatably support the spindle and vto hold the post and spindle in axial alignment, a. two'speed drive for said spindle including; a pai-r of pinions on the spindle and a driving wheel connected t0 the post and provided with a large bevel gear and a smaller bevel gear, and means whereby the frame may be secured in dierentpositions of longitudinal adjustment relative to the post to engage either ofthe gears with a pinion. Y

At. A breast drill comprising in combination, a main post, a rotating spindle provided with a chuck, a frame Vslidably secured' to said post and constructed to rotatablysupportthe spindle and to hold the post and spinl dle in axial alignment a two s eed drive for :s .i said spindle including 'cooperating bevel gears and ypinions,and means' whereby the frame may be secured` in different 4positions of longitudinal adjustment relative to the post to mesh different gears and pinions.

5. A breast drill comprising in combina; tion, ay main post, alframe slidably secured Y to said post, :a spindle rotatably supported Y by the frame and provided with a chuck, a

Y cilitate'inovernent ofthe 'post and wheelv vso Y' rotatably supporting said wheel and 'adapted d and post together in diftwo speed drive for said spindle including a pair of pinions on the spindle and. a driving wheel provided with alarge bevel'gearA i means for conand a smaller bevel gear, andneeting the driving wheel to the postfto farelative tothe frame i to engage either of the gears Awith av pinion.

said .post and provided with slot,

drive for-'said spindle-including arpair oit' pinions on the spindleand a driving Wheel provided with a large bevel gear and a smaller bevel gear, a transversely extending shaft for rotatably supporting said wheelandr adaptedto extend through said elongated v slot `and a portion of, to Volainp the post and ferent positions of adjustment with the'dif` ferent pinions and gears meshed.

said post uand operable `7. Abreastdrill comprising in cornbination a main ost a frameslidabl secured to 3 7 Y the post,-a spindle rotatably-supported, bythe frame and provided witha Chuck, atwo speed drive' for said spindle ineludinga pair Y of pinions on the spindle and a driving-wheel provided with a large bevel gear and a smaller bevel gear, a'transverselyextending shaft for to clamp .the freine Vferent positionspofrlongitudinal adjustments lOIlS.

tion, amain post, a frame. slidablyseeured to said post, a. spindle rotatably supported by a chuck,A a two speed drive for saidspindle'including a pair the frame and provided with of pinions on the spindle andk a driving wheel providedfwith a large bevelgear and a smaller bevel gear, and rn'eans 'for securing the post Vand frame in different positions of relative adjustmentv 'with the dierent gears and pinions `meshed including a-transversely extending Vbolt and a handle threaded on the bolt to clamp' it in different positions'.

In testimony whereof, naine to this specification.` v Y FRED-E, FARLEY. l

6. A breast drill eornprisingiin combina. y tion, a 1nain;post,-a franse slidably secured to an elongated a spindle rotatably Vsupported by'y the `traine and provided with a chuck, a two speed frame togetherin difv.

`8. A breast drill oomprising invcoinbina- `r 'I have signed my n 

